[7.2.0] Handle operation stream exception in wrapper (#22141)

A literal StatusRuntimeException thrown from a response stream iterator
(as an error response to the overall request) should have the same
consideration as one thrown from the operation response unwrap.

waitExecution requires an additional check for SRE thrown directly from
operation stream pop.
Existing NOT_FOUNDs that do not pass the inner retry check will
similarly be passed through.

To detect this NOT_FOUND in test, the actual exception thrown as a
result of thenError must be the error response from stream provided by
FakeExecutionService. This corrects a number of tests which did not
check for explicit exceptions and were relying on UNKNOWN SREs resulting
from errors during handling, and removes numerous thenAck()s required to
validate tests.

Closes #22067.

PiperOrigin-RevId: 628094669
Change-Id: I011d2c2321074a1a27dc853f6274ba9ef35f6db6

Commit
https://github.com/bazelbuild/bazel/commit/6d79e11a15e59b6d2ef6838efe780f7c0b820387



Co-authored-by: George Gensure <ggensure@lat.ai>